Domain health check

Find out if your domain is set up properly.

Domain Mechanic checks your domain's email settings and explains every result in plain English. You do not need an account.

The check is free. It only reads public DNS records, so it cannot change anything on your domain.

What we check

Five settings decide whether your email arrives, and whether other people can pretend to be you. We check all five and explain each one.

Where email for your domain is delivered. If this is wrong, you do not receive email.

SPF

The list of services allowed to send email as your domain, such as Microsoft 365 or your website.

DKIM

A hidden digital signature on each email that proves it really came from you and was not changed.

DMARC

Tells other mail servers what to do with email that pretends to be from you but fails the checks above.

Blocklists

Whether your mail servers are on a public spam list that could cause your email to be rejected. Coming soon.

Enter your domain
Type the part of your email address after the @ sign, for example example.co.uk.
Read your results
Each setting shows Pass, Warning or Fail, with one sentence that says what it means for you.
Fix what needs fixing
Every problem comes with step-by-step instructions, and the exact record to copy into your DNS settings.

Your results are not a reason to sell you something. We tell you what is wrong and how to fix it yourself.

A warning is a warning, not an emergency. Every result says how serious it really is.

Every technical word is explained the first time it appears, in plain English.